Compare MST and GMT
See the current time difference between MST and GMT, understand daylight saving changes, and find the best hours to schedule meetings.
MST GMT Time Difference
View the current offset between MST (UTC-7) and GMT (UTC+0) with side-by-side hour comparisons. Quickly see how many hours apart the two time zones are.
Track DST Time Changes
Monitor how daylight saving time can affect comparisons when regions using Mountain Time switch to MDT while GMT stays at UTC+0. The page updates automatically using the IANA timezone database.
Find Best Meeting Hours
Use the visual time grid and hour-by-hour table to spot overlapping work hours between MST and GMT. Export selected times with ICS download or share via Google Calendar and Gmail.
How to Find the Time Difference Between MST and GMT
Open the MST vs GMT page: Go to https://www.xconvert.com/time-converter/mst-vs-gmt. The page loads Mountain Standard Time and Greenwich Mean Time in a visual comparison grid, which is useful when you need to line up a call between a team in the western United States, Canada, or Mexico and contacts in the United Kingdom, Ireland, Ghana, or Iceland.
Add relevant comparison cities: Click + Add City and search for cities that matter to your schedule, such as Denver for Mountain Time business hours, London for UK meetings, and Accra for West African coordination. This is especially practical for remote teams in software, logistics, customer support, and consulting, where one group may work on MST while partners or clients follow GMT.
Select a workable meeting window: Click Select to enter selection mode, then drag across the grid on the MST row to highlight a time range in purple. For example, drag from 9:00 MST to 12:00 MST to see the matching 16:00 GMT to 19:00 GMT window, which helps confirm that a late-morning meeting in Mountain Time lands in the late afternoon for GMT-based participants.
Export and share the result: After selecting the time range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when you want to send a confirmed cross-time-zone slot to a UK client, add it to a distributed team calendar, or copy the exact overlap into an email thread without rewriting the times manually.
MST vs GMT Offset Explained
Mountain Standard Time is UTC-7, while Greenwich Mean Time is UTC+0. That means GMT is 7 hours ahead of MST, so when it is 9:00 MST, it is 16:00 GMT, and when it is 15:00 MST, it is 22:00 GMT. This gap matters for scheduling because a normal morning in MST often becomes an afternoon or evening appointment in GMT.
The difference is easy to see in common workday examples. 12:00 MST = 19:00 GMT, which makes noon in Mountain Standard Time a late-afternoon or early-evening slot for GMT-based teams. By 18:00 MST, the corresponding time is 1:00 GMT the next day, so evening calls in MST can push GMT participants into the following calendar date.
MST is a standard-time abbreviation, and its daylight saving counterpart is MDT. GMT is also a standard-time abbreviation, and its daylight saving counterpart is IST. In practical terms, this means the MST vs GMT comparison is most accurate when both locations are on their standard-time schedules; during daylight saving periods, the relationship can change, so seasonal planning for recurring meetings should account for whether Mountain regions have shifted to MDT and whether GMT-observing regions have shifted to IST.
MST is used in parts of Canada, Mexico, and the United States, while GMT is used across a wider group of countries including the United Kingdom, Ireland, Iceland, Ghana, Senegal, Sierra Leone, Liberia, Guinea, Guinea-Bissau, Mali, Mauritania, Togo, Burkina Faso, Gambia, Saint Helena, Sao Tome and Principe, Guernsey, Jersey, and the Isle of Man. That broad geographic spread makes the comparison relevant for industries such as transatlantic consulting, nonprofit coordination, aviation planning, and customer support operations serving both North America and GMT-based markets.
MST and GMT Scheduling Examples
A 7-hour lead means MST mornings often line up best with GMT afternoons. For example, 9:00 MST = 16:00 GMT and 12:00 MST = 19:00 GMT, which makes late morning in Mountain Standard Time a practical window for same-day business calls with GMT-based offices. This is often the sweet spot for legal reviews, project check-ins, and client presentations where both sides still fall within normal working hours.
The later the meeting starts in MST, the more likely it is to become inconvenient in GMT. 15:00 MST = 22:00 GMT, so a mid-afternoon Mountain Time meeting already lands late in the evening for GMT participants. By 18:00 MST = 1:00 GMT the next day, the call moves into overnight hours, which is rarely suitable except for urgent operations, incident response, or aviation and logistics coordination.
For recurring meetings, the safest approach is to anchor the discussion around a proven overlap window rather than guessing. A team that regularly meets between 9:00 MST and 12:00 MST can expect the matching GMT time to be 16:00 to 19:00, a range that is much easier to manage than late-day MST slots. This is particularly useful for distributed engineering teams, agencies with UK clients, and support organizations handling handoffs between North America and Europe or West Africa.
Where MST and GMT Are Used
MST is used in Canada, Mexico, and the United States, making it important for cross-border work across North American operations. Businesses in sectors such as energy, software, construction, transportation, and regional government services often need to coordinate Mountain Time schedules with overseas partners, especially when working with teams based in the UK or in GMT-observing African countries.
GMT has a broad international footprint, covering countries and territories including the United Kingdom, Ireland, Iceland, Ghana, Senegal, Sierra Leone, Liberia, Guinea, Guinea-Bissau, Mali, Mauritania, Togo, Burkina Faso, Gambia, Saint Helena, Sao Tome and Principe, Guernsey, Jersey, and the Isle of Man. That makes GMT a common reference point for international communication, especially in finance, shipping, education, media, and organizations that operate across Europe and West Africa.
Because GMT spans both major commercial centers and government institutions, MST-to-GMT coordination often appears in real business workflows. A company in the Mountain Time region may schedule an afternoon update for London-based stakeholders, align support coverage with teams in Accra, or confirm delivery timing with partners working on GMT. In each case, the fixed examples—such as 9:00 MST = 16:00 GMT—provide a practical baseline for avoiding missed meetings and after-hours scheduling.
Frequently Asked Questions
What is the time difference between MST and GMT?
GMT is 7 hours ahead of MST. In direct scheduling terms, when it is 9:00 MST, it is 16:00 GMT, and when it is 12:00 MST, it is 19:00 GMT. This means MST morning hours usually correspond to GMT afternoon or evening hours.
Is MST ahead of GMT or behind GMT?
MST is behind GMT. Since Mountain Standard Time is UTC-7 and Greenwich Mean Time is UTC+0, GMT runs 7 hours later on the clock. That is why 15:00 MST = 22:00 GMT, making a mid-afternoon MST meeting a late-evening GMT event.
What is 9 AM MST in GMT?
9:00 MST = 16:00 GMT. This is one of the most useful conversions for business scheduling because it places a Mountain Time morning meeting into a standard late-afternoon slot for GMT-based participants. It is often a practical time for cross-regional calls involving North America and the UK.
What is 12 PM MST in GMT?
12:00 MST = 19:00 GMT. Noon in Mountain Standard Time becomes early evening in GMT, which can still work for client calls, vendor check-ins, or project reviews, but it is already near the end of a typical business day in many GMT locations. For recurring meetings, teams often prefer slightly earlier MST slots to avoid pushing GMT participants too late.
What is 6 PM MST in GMT?
18:00 MST = 1:00 GMT the next day. This next-day rollover is important because an evening meeting in MST does not stay on the same calendar date in GMT. If you are booking travel support, overnight operations, or urgent incident calls, that date change needs to be clearly communicated.
Does the MST vs GMT difference stay the same all year?
The MST vs GMT comparison applies when both are on their standard-time designations. MST uses MDT as its daylight saving counterpart, and GMT uses IST as its daylight saving counterpart, so the offset relationship can change during daylight saving periods. For seasonal or recurring scheduling, it is important to confirm whether participants are still on MST and GMT or have moved to their daylight saving alternatives.
Which countries use MST and which countries use GMT?
MST is used in Canada, Mexico, and the United States. GMT is used in Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom. This wide spread makes MST-to-GMT conversion relevant for everything from transatlantic client meetings to nonprofit and government coordination.
When is the best meeting time between MST and GMT?
A practical overlap is often during the MST morning, because that maps to the GMT afternoon. For example, 9:00 MST = 16:00 GMT and 12:00 MST = 19:00 GMT, which keeps both sides within a reasonable same-day window. Once you move to 15:00 MST = 22:00 GMT, the meeting becomes much less convenient for GMT participants.